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To demonstrate Varroa-sensitive hygiene by SMR bees, a highly infested brood comb was cut into halves, and each half was placed in a cage with 2,000 test bees for 24 hours. Shown here is the brood comb of the SMR bees, which removed 215 pupae and uncapped another 178 pupae (90 percent of uncapped cells were infested with Varroa mites).